Use RTLD_DEFAULT to access symbols from the main program + already loaded dlls (previous version did not work under FreeBSD).

git-svn-id: http://caml.inria.fr/svn/ocaml/trunk@8494 f963ae5c-01c2-4b8c-9fe0-0dff7051ff02

byterun/unix.c

@@ -343,12 +343,12 @@ void * caml_dlsym(void * handle, char * name)
 
 void * caml_globalsym(char * name)
 {
-  return caml_dlsym(dlopen(NULL,RTLD_GLOBAL), name);
+  return caml_dlsym(RTLD_DEFAULT, name);
 }
 
 char * caml_dlerror(void)
 {
-  return dlerror();
+  return (char*) dlerror();
 }
 
 #endif